package com.xuehu.java2;

import com.xuehu.java1.Person;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class OtherTest {

    /**
     * 获取构造器
     */
    @Test
    public void test1() {

        Class clazz = Person.class;

        //getConstructors():获取当前运行时类中声明为public的构造器
        Constructor[] constructors = clazz.getConstructors();
        for (Constructor c : constructors) {
            System.out.println(c);
        }

        System.out.println();
        //getDeclaredConstructors():获取当前运行时类中声明的所有的构造器
        Constructor[] declaredConstructors = clazz.getDeclaredConstructors();
        for (Constructor c : declaredConstructors) {
            System.out.println(c);
        }

    }

    /**
     * 获取运行时类的父类
     */
    @Test
    public void test2() {
        Class<Person> personClass = Person.class;
        //获取父类
        Class<? super Person> superclass = personClass.getSuperclass();
        System.out.println(superclass);
    }

    /**
     * 获取运行时的带泛型的父类的泛型
     */
    @Test
    public void test3() {

        Class clazz = Person.class;

        Type superclass = clazz.getGenericSuperclass();

        System.out.println(superclass);

    }

    /**
     * 获取运行时类的带泛型的父类的泛型
     * <p>
     * 代码:
     * 逻辑性代码 vs 功能性代码
     */
    @Test
    public void test4() {

        Class<Person> clazz = Person.class;
        Type genericSuperclass = clazz.getGenericSuperclass();
        ParameterizedType parameterizedType = (ParameterizedType) genericSuperclass;
        //获取泛型类型
        Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
//        System.out.println(actualTypeArguments[0].getTypeName());
        System.out.println(((Class) actualTypeArguments[0]).getName());

    }

    /**
     * 获取运行时类的实现的接口
     */
    @Test
    public void test5() {
        Class<Person> clazz = Person.class;

        Class<?>[] interfaces = clazz.getInterfaces();
        for (Class c : interfaces) {
            System.out.println(c);
        }

        System.out.println();
        //获取运行时类的父类实现的接口
        Class<?>[] interfaces1 = clazz.getSuperclass().getInterfaces();
        for (Class c : interfaces1) {
            System.out.println(c);
        }

    }

    /**
     * 获取运行实类所在的包
     */
    @Test
    public void test6() {
        Class<Person> clazz = Person.class;
        Package aPackage = clazz.getPackage();
        System.out.println(aPackage);
    }

    /**
     * 获取运行时类声明的注解
     */
    @Test
    public void test7() {

        Class clazz = Person.class;
        Annotation[] annotations = clazz.getAnnotations();
        for(Annotation annotation : annotations) {
            System.out.println(annotation);
        }

    }
}
